I'd agree that history shows the results of foreign intervention as a mixed bag. I'm sure that there are other nations that have engaged in interventions and have a much similar mixed bag of results to show for it.
It would seem logical that these interventions have a common failure pattern, where successful interventions have a similar common success pattern, that we'd be wise to stop using the failure pattern and use the successful pattern, unless, of course, there are no patterns to be had.
Hard to believe that as noble and well intentioned the intervention that the percentages for success are against it. I wonder also if it's not an immediate need and action degrading and festering over time into more serious problems.